Chris Brown will spend Sunday on tragically-hip Melrose Ave. in L.A. ... curious indeed, since he's supposedly in lockdown rehab. But we've learned, the rehab joint gave him a day pass.
Chris won't be shopping in stores that sell overpriced, vintage gadgets. He's a featured celeb at the XMAS toy drive, where people come with unwrapped toys for underprivileged kids.
We're told Brown and his girlfriend Karrueche Tran will be front and center to mingle with everyone.
As for why Chris got a pass ... 2 reasons. It's a worthy event, and we're told the rehab folks actually think it will be good for Chris' treatment -- to show how satisfying it is to participate in non-violent activities.